期刊
CELL HOST & MICROBE
卷 30, 期 3, 页码 400-+出版社
CELL PRESS
DOI: 10.1016/j.chom.2022.01.003
关键词
-
资金
- Italian Ministry of Health [RF2013-02358960, COVID-2020-12371817]
- 5 per mille, 2021to Dr. Carsetti
This study investigated the long-term and functional B cell memory induced by the BNT162b2 mRNA vaccine against SARS-CoV-2 in healthcare workers. While specific antibodies declined over time, memory B cells persisted and increased, and breakthrough infections did not show signs of waning immunity.
Breakthrough SARS-CoV-2 infections in fully vaccinated individuals are considered a consequence of waning immunity. Serum antibodies represent the most measurable outcome of vaccine-induced B cell memory. When antibodies decline, memory B cells are expected to persist and perform their function, preventing clinical disease. We investigated whether BNT162b2 mRNA vaccine induces durable and functional B cell memory in vivo against SARS-CoV-2 3, 6, and 9 months after the second dose in a cohort of health care workers (HCWs). While we observed physiological decline of SARS-CoV-2-specific antibodies, memory B cells persist and increase until 9 months after immunization. HCWs with breakthrough infections had no signs of waning immunity. In 3-4 days, memory B cells responded to SARS-CoV-2 infection by producing high levels of specific antibodies in the serum and anti-Spike IgA in the saliva. Antibodies to the viral nucleoprotein were produced with the slow kinetics typical of the response to a novel antigen.
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